121312101 has 4 divisors (see below), whose sum is σ = 161749472. Its totient is φ = 80874732.

The previous prime is 121312069. The next prime is 121312109. The reversal of 121312101 is 101213121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121312101 - 2⁵ = 121312069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20218681 + ... + 20218686.

It is an arithmetic number, because the mean of its divisors is an integer number (40437368).

Almost surely, 2^121312101 is an apocalyptic number.

It is an amenable number.

121312101 is a deficient number, since it is larger than the sum of its proper divisors (40437371).

121312101 is an equidigital number, since it uses as much as digits as its factorization.

121312101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40437370.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 121312101 is about 11014.1772729514. The cubic root of 121312101 is about 495.0336350984.

Adding to 121312101 its reverse (101213121), we get a palindrome (222525222).

The spelling of 121312101 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred one".